Lubricating device for sewing machines



Oct. 30, 1945. s. ZONIS 2,387,968

LUBRICATING DEVICE FOR SEWING MACH NES Filed Dec. 9, 1943 Patented Oct. 30, 1945 Sydney Zonis, Bridgeport, Conn., assignor to The Singer Manufacturing Company, Elizabeth, N. J., a corporation of New Jersey Application December 9, 1943, Serial No. 513,567

'7 Claims.

This invention relates to lubricatingdevices for sewing machines and has for its object .to provide improved meansfor supplying lubricant to the crank-pin of a crank-member; the invention being particularly adapted for use in supplying lubricant to the needle-bar reciprocating crankmember of a sewing machine in which the bracket-arm shaft is rotatably journaled in an antifriction bearing adjacent .said crank-member.

.22 of Fig. 1, represents a fragmentary vertical section taken transversely of the arm-shaft of themachine in front of the oil-well segment-plate which is shown as partly broken away. Fig. 3 represents a perspective view of the oil-well segment-plate. I

The sewing machine in part illustrated in the drawing has a frame including a hollow bracketarm: I terminating in a head. 2 provided with a face-plate 3. Adjacent the head 2, the bracketarm I- ,isinternally provided with a transverse wall 4 having an opening 5 to receive an anti-friction shaft-bearing in the form of a ball-bearing 6. The ball-bearing 6 extends in partbeyond the wall 4 at the head 2 side of said wall.

Rotatably journaled in the ball -bearing 6 is a horizontally disposed needle-reciprocating Varmshaft 1 which extends lengthwise through the opening 5 into the bracket-arm head 2. Secured upon the end of the arm-shaft 1 within the-head 2,by means of a screw 8, is a counter-balanced crank-member 9; said crank-member having at one side thereof a short cylindrical hub-extension III in contact with the inner race-ring of the ball-bearing 6. The crank-member 9 is provided with an opening I I .in which a horizontally disposed crank-pin I2 is secured by a set-screw l3; saidcrank-pin l2 having the end thereof proximate to the ball-bearing 6 disposed substantially flush with the corresponding face of the crankmember 9. At its outer end, the crank-pin I2 has a flangeor head I4 which carries one of two connected needle-thread take-up disks I 5. I Between its ends, the crank-pin. I2 is provided with a circumferential flange I6 spaced from the' braces the crank-pin I2 and is disposed in a suitably recessed portion of the crank-member 9.

Journaled by means of a needle-roller bearing I8 upon the crank-pin I2 and confined by the flange I6 and the washer I! against movement endwise of said crank-pin, is an apertured boss I9 provided at one end of a connection-element functioning as a needle-reciprocating link 20. The other end of the link 20 is formed with an apertured boss ZI embracing astud-pin 22 extending laterally from and suitably secured upon a needle-bar 23; The needle-bar 23 is journaled for endwise vertical reciprocation in suitable bearings provided'in the bracket-arm head 2 and disposed at opposite sides of the stud-pin 22.

The present invention relates more particularly to specially devised means for supplying lubricant to the needle-roller bearing I8, To this .end, there is provided a segment-plate 25 which is detachably secured, by screws zfi, upon the bracket-arm wall II at the crank-pin I2 side of said wall. The curved edge 25' of the segment-plate 25 is preferably slightly larger than a semicircle and the chord-edge 25" is preferably substantially horizontal. The segment-plate 25 is circularly partly cut away at the wall tisidethereof to provide a segmental recess 21 affording clearance for the protruding portion of the ball-bearing 6.

At is oppositeside, the segment-plate 25 has a cylindrical flange 28 which is concentric with the curved edge 25 and extends partly below the chord 25" of the segment-plate. The portion 28' of the flange 28 which extends below the chord radially inner wall-face of said recesslill being flush with and forming a continuation of the outer face of the hub-extension III. The radially outer wall face 3| of the recess 30 is undercutto increase progressively in diameter inwardly of said recess 30. r

V The crank-pin I2 is partly cut away adjacent the plate-flange 28 to provide a recess 32 which forms a continuation of the recess 30 of the crank- The upper portion of the segment-plate 28 is provided with an elongate oil-Well cavity 35. Ex-

collecting recess and the connection-element bearing upon said crank-pin, said crank-member oil-duct extending from said oil-collecting recess at an inclination away from the rotation axis of said shaft.

3. In a sewing machine, a frame having a wall provided with an opening, an antifriction bearing disposed in said opening,'a rotary shaft extending through said opening and journaled in said bearing, a crank-member carried by said shaft at one "side of said wall and having a cylindrical hubtending vertically downwardly from opposite ends of the bottom wall of the oil-well cavity 35 are segment-plate apertures or ducts v3E3 connected to horizontal ducts 3'! provided in the flange 28 of the segment-plate at diametrically opposite sides thereof and substantially at the level of the axis of rotation of the arm-shaft I. Lubricant may be supplied to the oil-well 35 through an aperture 38, provided in the wall of the bracketarm I above the oil-well.

The lubricant passes gravitationally from the oil-well 35 through the connected ducts 36 and 31, and is discharged by the ducts 31 into the crank-member recess 30. Upon rotation of the shaft 1, the oil collected in the crank-member recess 38 is centrifugally supplied to the needleroller bearing l8 through the crank-pin inclined ductl33 and the connecting duct 34. l

The spacing of the lower portion 28 of the segment-plate flange 28 from the ball-bearing 6 reduces.to a minimum conduction of oil by capil- I lary action from the lower portion of the crankmember recess 30. The described construction definitely insures the delivery of oil from the oilwell to the needle-roller bearing I8.

Having thus set forth the nature of the invention, what I claim herein is:

' 1. In a sewing machine, a frame including a wall provided with an opening an antifriction bearing disposed in said opening, a rotary shaft extending through said opening and journaled in said bearing, a crank-member carried by said shaft at one side of said wall and provided in its face proximate to said wall with an oil-collecting recess, a crank-pin carried by said crank-memher, a connection-element journaled upon said crank-pin, a plate secured upon said wall and having a portion thereof extending into said oilcollecting recess of the crank-member, an oil-well provided in said plate above the level of said oilcollecting recess, an oil-duct in said plate connecting said oil-well and said oil-collecting recess, and oil-conducting means connecting said oil-collecting recess and the connection-element bearing upon said crank-pin.

2. In a sewing machine, a frame including a wall provided with an opening, an antifriction bearing disposed in said opening, a rotary shaft extending through said opening and journaled in said bearing, a crank-member carried by said shaft at one side of said wall and provided in its face proximate to said wall with an annular oilcollecting recess, a crank-pin carried by said crank-member, a connection-element journaled upon said crank-pin, a plate secured upon said wall and having a flange surrounding said shaft and extending into said oil-collectingrecess, an oil-well provided in said plate above the level of said oil-collecting recess, an oil-duct in said plate extending from said oil-well and through said flange to terminate in said oil-collecting recess, and a crank-member oil-duct connecting said oilportion extending toward said antifriction bearing, said crank-member being provided in its face proximate to said wall with an annular oil-collectingrecess, and said oil-collecting recess having an undercut radially outer wall and having the radially inner wall thereof forming a continuation of said hub-portion of the crank-member, a crank-pin carried by said crank-member, a connection-element journaled upon said crankpin, a plate secured upon said wall at the crankmember side thereof having a flange surrounding'said hub-portion of the crank-member and extending into said oil-collecting recess, an oil supply duct extending through said flange to terminate in said oil-collecting recess, and oil-con-' ducting means connecting said oil-collecting recess and the connection-element bearing upon said crank-pin. t i i 4. In a sewing machine, a frame including a Wall provided with an opening, an antifriction bearing disposed in said opening and protruding from one side face of said wall, a rotary shaft extending through said opening and journaled in said bearing, a crank-member carried by said shaft and having a hub-extension in engagementrwith the protruding portion of saidballbearing, said crank-member being provided in the side face thereof proximate to said wall with an annular oil-collecting recess, and said oil-collecting recess having an undercut radially outer wall and having the radially inner wall thereof forming a continuation of said hub-extension of the crank-member, a crank-pin carried by said crank-member having an oil-duct connecting said oil-collecting recess with a connnectionelement bearing of said crank-pin, a connectionelement journaled upon said crank-pin, a plate secured upon said wall at the crank-member side of said wall and having a clearance recess for the protruding portion ofsaid ball-bearing, said plate having an annular flange surrounding said hubextension and entering said oil-collecting recess of the crank-member, an oil-well provided in said plate above the level of said oil-collecting recess, and an oil-duct extending from said oil-well and through said flange to terminate in said oilcollecting recess of the crank-member.

5. In a sewing machine, a frame including a 7 wall provided with an opening, an antifriction bearing disposed in said opening, a'rotary shaft extending through said opening and journaled in said bearing, a crank-member carried by said shaft at one side of said Wall and provided in its face proximate to said wall with an annular oil-collecting recess, a crank-pin carried by-aid crank-member having an oil-duct com'iecting said oil-collecting recess with a connection-elament bearing of said crank-pin, a connectionelement journaled upon said crank-pin, a plate disposed between said crank-member and said wall and having an annular flange extending into said oil-collecting recess of the crank-member, said flange surrounding said shaft and having the lower portion thereof spaced from said antifriction bearing, and oil-conducting means in said plate terminating in said oil-collecting recess.

6. In a sewing machine having a frame including a hollow bracket-arm provided with a transverse wall, an antifriction bearing supported by said wall, a shaft extending through said wall and rotatably journaled in said antifriction bearing, a crank-member carried by said shaft adjacent said wall and provided with a crank-pin, said crank-member having the side face thereof proximate to said wall provided with an annular oil-collecting recess encircling said shaft, a needle-bar journaled for endwise reciprocation in said bracket-arm, a connection-element journaled upon said crank-pin and operatively connected to reciprocate said needle-bar, a plate secured to and disposed at the crank-member side of said wall, said plate having an annular flange encircling said shaft and extending into said oilcollecting recess, an oil-well in said plate, an oilduct in said plate leading from said oil-well and extending through said flange to terminate in said recess, and a crank-pin oil-duct extending from said oil-collecting recess to the connectionelement bearing of said crank-pin.

I 7. In a sewing machine having a frame including a, hollow bracket-arm provided with a by and protruding from a side face of said wall,

a shaft extending through said wall and rotatably journaled in said antifriction bearing, a crankmember carried by said shaft at the side of said wall from which said bearing protrudes, said crank-member having the side face thereof proximate to said Wall provided with an annular oilcollecting reces encircling said shaft, a crankpin carried by said crank-member, a needle-bar journaled for endwise reciprocation in said bracket-arm, a connection-element journaled upon .said crank-pin and operatively connected to reciprocate said needle-bar, a stationary plate disposed at the crank-member side of said wall and having a portion thereof extending into said oilcollecting recess of the crank-member, said plate being provided in its side face proximate to said wall with a reces affording clearance for the protruding portion of said antifriction bearing, an oil-well in said plate, an oil-duct formed in said plate connecting said oil-well and said oil-collecting recess, and a crank-pin oil-duct extending from said oil-collecting recess to the connectionelement bearing of said crank-pin.

SYDNEY ZONIS. 

